2560 X 1440 is a pretty high pixel density. I would consider 1440P more of an enthusiast/advanced resolution lol. No arguments on the greater clarity and level of detail in images and video provided the source input is 1440P, but i
t will be harder to read.
It's a bit counter intuitive but we actually want a monitor with fewer pixels per inch (PPI). This makes things look bigger but not sharper.
The reason why we are recommending 1080P at that resolution is that the text is pretty visible without any DPI scaling. DPI scaling doesn't always work. For instance, 150% DPI scaling on 1650x1050 on AC would cause it not to fit the screen. I'm sure some people have noticed things being cut off when the scaling is too high. There's 78% more pixels in 1440P so things will definitely seem smaller. In an ideal world where DPI scaling worked perfectly 27" 1440P with DPI scaling would be better.
Here's a good comparison of a 1440P and 1080P 27" monitor:
https://pcmonitors.info/articles/2560-x-1440-vs-1920-x-1080/While I personally would go with a 1440P monitor, I would recommend the 1080P for anyone with trouble seeing. The extra contrast on the Ben Q will also be helpful.